a = [2,5]
b = [2,5]
x = id(a)
print(x)
y = id(b)
print(y)
a[0] = 9
print(a)
print(b)
print(id(a))
print(id(b))
print(type(a))
print('isinstance(a,str): ', isinstance(a,str))
print('isinstance(a,list): ', isinstance(a,list))
print(isinstance(a,(str,float)))
try:
    assert isinstance(a,str)
except AssertionError:
    breakpoint()
    print('type error')
print('goodbye')